How to align and snap objects?
The two answers you already got for this on your previous question are really the most accurate ways I know to do this. but if you're looking for something simpler then here are a couple more options for you.


You can snap everything to Blenders grid by either turning on the snap function here


or by holding Ctrl as you move your objects.


Move objects along axis by entering a value, eg. if you have a cube that's 2 units long along the X-axis and its origin is in the middle and you want to add another flush along side on the X axis, Duplicate the cube and press G, X, 2 to move it along the X